Computer generated image for a display screen



FIG. 1 is a front view of a computer generated image for a display screen

FIG. 2 is a front view of a second embodiment thereof;

FIG. 3 is a front view of a third embodiment thereof; and,

FIG. 4 is another front view of the first embodiment.

The broken line showing of a display screen in all views, and the broken line features within the claimed subject matter are not part of the claimed design. 

The ornamental design for a computer generated image for a display screen, as shown and described. 